blue carbon
"Blue carbon is carbon sequestration by the world's oceanic and coastal ecosystems, mostly by algae, seagrasses, macroalgae, mangroves, salt marshes and other plants in coastal wetlands. This occurs through plant growth and the accumulation and burial of organic matter in the soil." ¹
¹ https://en.wikipedia.org/wiki/Blue_carbon
¹ https://en.wikipedia.org/wiki/Blue_carbon
(redirect to https://www.thebluecarboninitiative.org)